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Thai people who originally lived in southwestern China migrated into mainland Southeast Asia over a period of many centuries. The oldest known mention of their existence in the region by the exonym Siamese is in a 12th-century A.D. inscription at the Khmer temple complex of Angkor Wat in Cambodia, which refers to syam, or “dark brown“, people. It was believed that Siam derived from the Sanskrit word syam, or “brown race“, with a contemptuous signification. Sien in Chinese writings is the name for the northern kingdom that centered around Sukhothai and Sawankalok; but to the Siamese themselves, the name of the country has always been Mueang Thai. The country's designation as Siam by Westerners likely came from the Portuguese, the first Europeans to give a coherent account of the country. Portuguese chronicles noted that the king of Sukhothai had sent an expedition to Malacca at the southern tip of the Malay Peninsula in 1455. Following their conquest of Malacca in 1511, the Portuguese sent a diplomatic mission
